Pathology Failure of Hertwig’s epithelial sheath diaphragm to investigate the proper horizontal level leads to: A Taurodontism. B Dentin dysplasia. C Pulp polyp. D Amelogenesis imperfecta. 💡 Explanation Failure of Hertwig's epithelial sheath diaphragm to investigate the proper horizontal level leads to: ✓ Correct Answer: A. Taurodontism.